Method for counting quantity of sheet materials

A method for counting quantity of sheet materials applied to a pile of sheet materials, comprising the steps of: receiving an image of the pile of sheet materials; obtaining a grayscale value of a plurality of pixels along a first image axis of the image to form an one dimensional first array; performing binarization of the first elements of the first array with a first threshold value to form an one dimensional second array; counting a quantity of the second elements of a first value appearing between two second elements of a second value in the second array to form a third array; dividing the elements of the third array into a first cluster and a second cluster with a second threshold value; counting the quantity of the third elements belonging to the first cluster and defining the quantity of that as the quantity of the first sheet materials.